One or two of these tiny receivers can be used directly with Ruby with no need for a full sized receiver. It links to Ruby without an adapter, just a thin adapter cable. It uses a digital format that is less prone to configuration problems.

We carry these in stock and sell them for $15.

A Ruby adapter cable is required for each. We can provide cables free of charge with purchase of Ruby. Additional cables are $5. Standard length is 2 feet. We can create custom length cables for you at no additional charge.